Control mechanism



Nov. 4, 1947. c. A. AREN- CONTROL MEcHANisM Filed Jan. 23,4 1943y .2 SheetS-Shee't l A wv ,EW

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NOV. 4, 14947. C, A, ARENS CONTROL MECHANISM 'Filed Jan. 25, 1943 2 Sheets-Sheet 2 IN VEN TOR.

www a. @new Patented Nov. 4, 1947 UNITED STATES PATENT OFFICE CONTROL MECHANISM Charles A. Arens, Chicago, Ill., assignor to Arens Controls, Inc., Chicago, VIll., a corporation of Illinois Application January 23, 1943, Serial No. 473,306

20 Claims. l

This invention relates to control mechanisms,-

particularly of the type adapted to releasably lock or hold an adjustable control member in adjusted position.

It is an object of the invention to provide a control mechanism of the type stated of improved construction and operation; and more specifically to provide a control mechanism of smooth operation and good locking effectiveness wherein the parts may be readily fabricated and assembled to provide a reliable control mechanism structure.

A further object of the invention is to provide a control mechanism of the type dened having an improved handle structure, facilitating both assembly and operation.

A still further object of the invention is to provide a control mechanism of the type dened wherein in association with the locking or holding means, improved mechanism is provided for effecting micrometer adjustments of the controlled structures.

Various other objects, advantages and features of the structure will be apparent from the following specication when taken in connection with the accompanying drawings, wherein certain preferred embodiments are set forth for purposes of illustration.

In the drawings, wherein like reference numerals refer to like parts throughout:

Fig. 1 is a general assembly View of a control mechanism constructed in accordance with and including the structures of the invention, in accordance with one preferred embodiment thereof;

Fig. 2 is a longitudinal sectional View, on any enlarged scale, f a portion of the control mechanism of Fig. 1;

Fig. 3 is a view similar to Fig. 2 but showing the locking or holding means in released position;

Fig. 4 is a transverse sectional View of the structure on a further enlarged scale, and taken on the line 4 4 of Fig. 2;

Fig. 5 is a view similar to Fig. 4 but showing the locking or holding means in released position, as indicated by the line 5-5 of Fig. 3;

Fig. 6 is an vexploded view showing various parts of the control mechanism;

Fig. l is a view similar to Fig. 2 but illustrating a modified embodiment of the invention;

Fig. 8 is a partial view of the structure of Fig. 7, but illustrating the locking or holding means in released position;

Fig. 9 is a detail perspective view of the control or locking rod, as embodied in the structure of Fig. 7;

Fig. l0 is a transverse sectional View of the structure of Fig. '7 on the line IU-IU thereof;

Fig. 11 is a sectional view of a control mechanism, similar to Figs. 2 and '7, but illustrating a still further modiiied embodiment of the invention;

Fig. 12 is a transverse sectional view of the structure of Fig. l1 on the line I2--l2 thereof;

Fig. 13 is a detail view of the handle structure as embodied in the device of Fig. 11, and showing the handle in released position; and

Fig. 14 is a longitudinal sectional View, on an enlarged scale, of the mechanism of Fig. 11, and taken on the line Ill- I4 thereof.

This application is a continuation-impart of my prior copending application, Serial No.`395, 980, filed may 31, 1941, and entitled Control mechanism, now issued as Patent 2,340,830, dated February 1, 1944.

Referring more specifically to the drawings,

vand rst to the embodiment illustrated in Figs.

1 to 6, inclusive, the control mechanism shown comprises a housing or frame member I0, threaded along a portion of its length, as indicated at II, and adapted to be secured by means of nuts I2 and I3 to a support panel or wall structure Id. Specically, the frame member l) is in the form of an elongated sleeve of suitable length to provide a slidable support structure for the shiftable parts of the control mechanism.

`As shown in Fig. 2, an operating member in the form of an elongated rod I5 is longitudinally slidable within the frame sleeve I0, the end of the operating rod being drilled or otherwise suitably formed to provide a sleeve-like end section as indicated at I6. The rod I5 may be connected in any suitable manner to a device to be controlled such, for example, as an elongated exible transmission cable, lever, or other controlled mechanism. As shown in Fig. 1, the end of the rod I5 is threaded as indicated at Il, and provided with a fitting I8 by which it is secured to one arm of a bell-crank lever I9 suitably pivoted to a frame or other supporting element as indicated at 20. The other arm 0f the bell-crank is connected to operate a link 2l leading to the controlled device. It is to be understood that the connections shown are set forth for purposes of illustration only and that the operating member I5 may be arranged to operate various control mechanisms. As stated, a device of the character shown is well adapted for the operation of elongated fleXible controls, such as Bowden wires and 3 the like, for use in aircraft and other vehicle installations. In such instances the support wall 4 Would, for example, constitute the control panel or dashboard of the vehicle or aircraft.

A control or locking member 25, Fig. 2, is longitudinally reciprocable through predetermined limits within the sleeve-like portion I6 of the operating member. The member 25 is in the form of an elongated rod or shaft. As best shown in Fig. 6, this rod is provided adjacent its inner end with a substantially semi-cylindrically shaped recess or cut away portion 26 which recess is adapted to receive and control the movements of a locking or holding element 21. This locking or holding element may take various forms, but preferably it is a rotatable element Such, for eX- ample, as a ball or roller. Also, preferably it comprises a roller of the shaping which is best illustrated in Figs. 4 and 5 providing maximum smoothness and effectiveness in its cooperation with the coacting parts. More specifically, referring to Figs. 4 and 5, the roller 21 is provided with a cylindrical surface 28 and at its opposite ends Iwith conical surfaces 29 and 38. These conical end surfaces are curved to conform to the curvature of the internal surface 3| of the housing sleeve whereby to provide a maximum surface of Contact between the holding element 21 andthe housing sleeve when the element is brought into engagement with the sleeve, as indicated in Fig. 4. Similarly, the cylindrical surface 23 of the holding element provides maximum areas of contact between the element and the engaged surfaces of the operating sleeve I6. To this end, as best shown in Fig. 6, the operating sleeve is provided with a notch or cut-out, which notch provides in the sleeve an angular cam surface 33 for locking or holding cooperation with the element 21, and an abutment surface 34. The cam surface 33 is flat, and provides with the cylindrical surface 28 of the holding element a maximum area of contact. By properly proportioning the size of the element 21, as to diameter and length, the areas of the cylindrical surface 28 and of the conical end surfaces 29 and 30 may be proportioned in a manner so as to provide the proper and desired surfaces of contact between the holding element and the operating and holding sleeve surfaces 33 and 3|, depending upon the hardness of the materials, operating forces, et cetera. By this means the holding element 21 is prevented from imbedding itself within the sleeve surfaces 33 and 3|, or otherwise marring or indenting either the sleeve surfaces or the engageable surfaces of the element itself. Smoothness of operation, ready releasability, and maintained durability and reliability of the structure is. insured.

In operation, it will be seen that when the control rod 25 is in its rightward position, as indicated in Figs. 3 and 5, the holding or locking element 21 lies within the cut-out 26 of the rod 25, out of engagement with the surface 3| of the housing sleeve. In this condition of the parts the operating member either direction with respect to the housing or frame sleeve l0. However, when the control rod 25 is shifted to its rightward position, as indicated in Figs. 2 and 4, the holding roller 21 is brought into engagement with the angular cam surface 33 of the operating sleeve I6 and with the internal surface 3| of the housing sleeve, as shown in Fig. 4, and in this condition of the parts, While the operating sleeve may still be relatively freely pulled to the left as seen in Figs. 1, 2 and I may be readily shifted in 3, rightward movement of the sleeve is prevented due to the wedging action of the roller 21 against the surfaces 33 and 3| as rightward movement of the operating sleeve is attempted.

A relatively light compression spring 35, Figs. 2 and 3, is provided, engageable against the end of the control rod 25, for normally urging the rod into its leftward or locking position, as shown in Fig. 2.

A handle structure is provided for controlling the shiftable movements of the operating sleeve l5, and also for shifting the control rod 25 to its rightward or release position. More specifically, this handle structure comprises a main handle member 38 substantially in the form of a spherical ball as shown in Figs. l, 2 and 3, which handle member is secured on the end of the operatingv sleeve l5 by means of a bushing 39 pressfitted into the handle member and threaded onto the threaded end portion 40 (see Fig. 6) of the operating sleeve. A spacing and locking sleeve 4| is also. threaded onto. the end portion 4G of the operating sleeve, this spacing sleeve being adapted to abut the nut I3 when the control mechanism is. moved to its Fig. 3 position, whereby to limit the inward movement of the operating sleeve. rl"he bushing 39 may be threadedly adjusted along the threaded portion 4G of the operating sleeve, whereby to accurately position the handle 38' thereon, particularly in reference to the length of the control rod 25, the sleeve 4l then being turned into abutting engagement with the bushing 39 so that the sleeve locks the handle in position, similar to the action of a lock nut,

A conical spring 43, Fig. 2, is disposed within the central recess of the handle knob, the convolutions of the spring at its inner end, as indicated at 44 being of such size that they provide a tight frictional grip with the inner surface 45 of the handle recess. 'I'he outer convolutions of the spring, as indicated at 46, frictionally embrace and grip the projection 41 of a release button 48, which projection is provided with a central recess 49, Fig. 6, adapted for cooperation with. the outer endv of the control rod 25.

lit will be seen that -by the arrangement thus provided, the release button 43 may be rst assembled with respect tov the. handle member 38, prior to the assembly of the handle upon the operating sleeve |.6 into which the control rod 25 has previously been inserted. In other words, the conical spring 43 forms means by which the release button 48 may be first assembled with respect to the handle 38, and the composite handle and release buttonV assembly then brought into posi-tion for engagement with the other parts of the structure. If for any reason the handle 38 is later removed from the other structural parts, the release button 48 will automatically be removed as a unit therewith, due to the frictional gripping actions of the conical spring 43. At the same time the release button is shifta'bly mounted with respect to the handle so that it can be moved from an outward position as indicated in Fig. 2, to an inner position in contact with the end wall of the handle, as shown in Fig. 3. When the release button is operated toits Fig. 3 position, it engages the end of the control rod 25 and shifts the latter to release the holding element 21. By means of the handle 33, the operating sleeve Y I6 is sliiftable to its various positions of adjustment.

It will be seen that the structure thus provided may be readily fabricated and assembled. The frame i0 is in the form of a simple elongated sleeve which may be readily made and assembled into position with respect to the support wall lli. Similarly the operating shaft I5 with its associated sleeve portion IB may be readily fabricated, and the centrally disposed control -areas of contact bo-th with the housing sleeve surface 3l and with the angular cam locking surface 33 of the operating sleeve I6 provides durability, ready releasability, and eiiiciency of operation. The engageable surfaces will not become pitted or marred whereby to produce lack of smoothness in the operation of the structure.

In Figs. 7 to l0 inclusive a modified embodiment is illustrated, generally similar to the embodiment previously described, butincorporating a modified form of handle, and also incorporating means for providing an increased frictional resistance to movement of the operating sleeve outwardly or to the left as seen in Fig. '7, when the locking or holding means is in operative position.

More specifically, referring to Fig. 9, in this instance the control rod indicated at d, and corresponding to the rod 25 previously described, instead of being provided with a notch in the form of the notch 25, is provided with a notch forming an abutment surface 55 and a cam surface 56 for cooperation with the locking element. The locking element, as indicated at 21a, may be of the shape and form of the locking element 2l previously described, and the operating and frame sleeves Ia and ma, respectively, may also be of the structure previously described in reference to the sleeves IE and lil.

In operation, when the control rod 25a, is in its rightward or release position, as shown in Fig. 8, the holding element 2id is held in a released positon, such for example as previously described in reference to Fig. 5. However, when the control rod is shifted to the left by the spring 36a, as illustrated in Fig. 7, not only is the locking element 21a brought into engagement with the surface Sla of the frame sleeve and the cam surface i 33a of the operating sleeve, but also the angular cam surface 56 of the control rod is compressed against the element 2id. This action tends to thrust the control rod 25a. downwardly, as seen in Figs. 7 and 10, thereby bringing the operating sleeve into frictional engagement with the frame sleeve along an area as indicated at 5? in Figs. 7 and 10, whereby to resist movement of the operating sleeve iii@ relative to 'the frame sleeve. Whereas the spring 36 in the embodiment previously described would preferably be a light spring sufficient only to 4shift the locking element into operative position, in the structure of Fig. 7 the spring 36a may be of somewhat increased size or tension whereby toprovide the.'

desired frictional resistance at the point 51. Accordingly, in the structure of Fig. '7, when the element 21a. is in holding or locking position not only is the operating sleeve Ilia precluded from movement to the right, as seen in Fig. 7, by a sub-f` stantially positive locking action, but also a predetermined frictional resistance to movement of the operating sleeve to the left is provided, the magnitude of which may be controlled as desired.

The handle structure illustrated in Fig. '7 differs -somewhat from that previously described, but

embodies `the same principles of construction. More specifically, the main operating handle is in `this instance formed of a body portion 53 provided with a pair of oppositely extending projections 59 and 60 whereby to provide a T handle structure. As in the previously described embodiment, a bushing as indicated at 39a is pressfitted into the handle, the bushing being screw threaded onto the end of the operating sleeve Ilia. Also, a lock nut kand spacing member Ma. is provided similar in purpose and function to the sleeve 4l described in reference to Figs. 1-6.

A spring 43a is of such size that it has frictional gripping engagement with the internal surface 6l of the bushing 33a. This-spring also has frictional gripping engagement with the surface 62 of an internal bore formed in the release button 43a whereby the spring holds the release button associated with the main operating handle, similar to the function and purpose of the spring 43 in the embodiment of Figs. 1-6. In operation, when the release button 48a is pressed inwardly or to the right as seen in Fig. 7, it engages the controlrod 25a to shift it into released position, for example as indicated in Fig. 8. The function and purpose of the release button d8a is similar to that previously described in reference to the release button 48. It will be understood that the springs 43 and 43a not only hold the release buttons in association with thelhandle structure, but also normally hold the release buttons outwardly in inoperative position as indicated, respectively,

helical groove as indicated at t5.

in Figs. 2 and 7.

In Figs. 11 to 14 inclusive a still further embodiment of the invention is illustrated. This embodiment is generally similar to that previously described in reference to Figs. 7-10 except that it additionally embodies micrometer adjustment means, and also a slightly different form of handle structure is provided.

In this instance the main frame or housing sleeve, as shown at [b is provided along its internal surface with a screw thread or similar Accordingly, when the holding element 2lb is thrust into locked position, as shown in Figs. l1, l2 and 14, instead .of engaging a smooth internal surface on the housing sleeve, the ends of the holding element are brought into engagement with the grooves of the internally formed screw thread` This action locks the operating sleeve |619 against direct axial shifting, but upon the imparting of a rota,- tional movement to the operating sleeve, the operating sleeve together with the holding element 2lb and the control rod 25D are all rotated as a unit within the housing sleeve and threaded therealong in the nature of a nut and bolt connection, whereby to effect micrometer adjustments of the operating sleeve. It will be seen that by reason of the arrangement provided 'micrometer adjustments may be effected by rotation of the operating sleeve while the sleeve remains locked against direct axial shifting.

To facilitate the rotation of the operating sleeve, the end thereof may be connected to the controlled device such,for example, as an elongated transmission cable, by `inea-ns of a ball and socket connection asindicated at 66, '51, forming a universal joint. As will be best seen by reference to Fig. 14, the pitch of the screw thread 65 lis such that the opposite ends 68 and 69 of the `holding element are brought into engagement with corresponding portions of the screw thread contour vwhereby to insure proper balance in the action of the parts. It will be seen that two points .cf engagement between the screw thread and the holding element are provided, The ends of the holding element may be shaped to properly engage the surfaces of the screw thread, as shown. The housing sleeve 10b, the operating sleeve lGb, and the control rod 25h may be formed as in the embodiment illustrated in Fig. '7.

Referring to the handle structure illustrated in Fig. 11, this handle may be generally similar to the structure shown for example in Fig. 2 except that the contour of the handle member, as indicated at 38h, is somewhat diierently shaped and is provided on its exterior periphery with .serrations or knurling as indicated at l I, to facilitate rotation of the handle and thereby effect the rotation of the operating sleeve. Also in this in- :stance the release button as indicated at 48h is .secured to the main body of the handle by means of a sponge rubber connection as indicated at 12. This sponge rubber performs the same function and purpose as the conical spring 43 in the embodiment illustrated in Fig. 2. More specically, the sponge rubber piece is adhesively secured to the main handle and to the release button as indicated at 'I3 and M, thereby associating the main handle and release button together as a unit, and permitting their assembly in the completed structure as a unit, as in the case of the embodiments previously discussed. The manner in which the sponge rubber lexes to permit operation of the release button is indicated in Fig. 13.

It is obvious that various changes may be made in the specific embodiments set forth without departing from the spirit of the invention. The invention is accordingly not to be limited to the specific embodiments shown and described, but only as indicated in the following claims.

The invention is hereby claimed as follows:

l. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable within the frame member and adapted to be connected to a device to be controlled, a handle for the operating member, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a holding element adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, and means for controlling the operation of the holding element comprising a shiftable control member loosely engaging the holding element, and a handle for the control member juxtaposed to the operating member handle, said control member being concentrically disposed within the operating member at the holding station,

2. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable within the frame member and adapted to be connected to a device to be controlled, a handle for the operating member, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a holding element adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, and means for controlling the operation of the holding element comprising a shiftable control member loosely engaging the holding element, and a handle for the control member juxtaposed to the operating member handle, said control member being disposed in parallel relation with the operating member and being disposed within the operating member at the holding station.

3.. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect to the frame member and adapted to be connected to a device to be controlled, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a holding element adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, and means for controlling the operation of the holding element comprising a shiftable control structure and a handle associated therewith, and a spring directly engaging the control structure for shifting it in a predetermined direction, said control structure loosely engaging the holding element and being symmetrically formed and of substantially uniform cross section along its length between the holding element engaging portion and said handle.

4. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable within the frame member and adapted to be connected to a device to be controlled, a handle for the operating membel', and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a ho'ding element comprising a roll member adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, and means for controlling the operation of the holding element comprising a shiftable control member having a notch loosely receiving the roll, and a handle for the control member juxtaposed to the operating member handle, said control member being concentrically disposed within the frame member and the operating member at the holding station.

5. A control mechanism comprising a frame sleeve adapted to be fastened to a support, an operating sleeve shiftable within the frame sleeve and adapted to be connected at one end to a device to be controlled, a handle connected to the other end of the operating sleeve, and means for releasably holding the operating sleeve with respect to the frame sleeve comprising a pair of cam surfaces on the operating sleeve and frame sleeve and a holding element adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, and means for controlling the operation of the holding element comprising a shiftable control rod loosely engaging the holding element, and a handle for the control rod juxtaposed to the Operating sleeve handle, said control rod being disposed within the operating sleeve in parallel relationship therewith.

6. A control mechanism comprising a frame sleeve adapted to be fastened to a support, an operating sleeve shiftable within the frame sleeve and adapted to be connected at one end to a device to be controlled, a handle iied on the other end of the operating sleeve, and means for releasably holding the operating sleeve with respect to the frame sleeve comprising a pair of cam surfaces on the operating sleeve and frame sleeve and a holding roll element adapted to he 7. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect to the frame member and adapted to be connected to a device to be controlled, and means for releasably holding the operating member with respect` to the frame member comprising a pair of cam surfaces positively connected to the operating member and the frame member and a holding element cooperable therewith to effect a holding action therebetween, said holding element comprising an elongated roller having independent surfaces thereof shaped to conform respectively to each of said cam surfaces, and a shiftable control member for controlling the operation of the holding element.V

8. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect to the frame rhember and adapted to be connected to a device to be controlled, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a holding element adapted to be wedged therebetween, said holding element comprising an elongated roller having independent surfaces thereof shaped to conform respectively to each of said cam surfaces te provide a maximum contact area therewith, and a shiftable control member for controlling the operation of the holding element.

9. A control mechanism as defined in claim 5, wherein said holding element comprises an elongated roller having the ends thereof shaped to provide line contact with the surface of the housing sleeve.

10. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect to the frame member and adapted to be connected to a device to be controlled, and means for releasably holding the operating member with respect to the frame member comprising a pair of relatively angularly disposed cam surfaces positively connected with the operating member and frame member and a holding element cooperable therewith to effect a holding action therebetween, and a shiftable control member for controlling'the operation of the holding element, said control member being provided with a tapered face engageable with the holding element to effect a frictional holding engagement between the operating member and the frame member.

ll. A control mechanism as defined in claim 5, wherein said shiftable control rod is provided with a tapered face engageable With the holding element to eect the friotional holding engagement of the operating sleeve with the frame sleeve.

12. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect to the frame member and adapted to be connected at l device to be one end to a device to be controlled, a handle connected to the other end of the operating member, and means for releasably holding the operating member with respect to the frame member comprising a pair of relatively angularly disposed cam surfaces positively connected with the operating member and frame member and a holding element cooperable therewith to effect a holding action therebetween, and a shiftable control member having a handle juxtaposed to the handle of the operating member for controlling the operation of the holding element, and meansoperable upon rotation of the operating member when the holding element is in holding position to effect micrometer longitudinal adjustment of the operating member with respect to the frame member. Y

13. A control mechanism as defined in claim 12, wherein said last named means comprises a screw thread formed along the inner surface of the frame member. W

14. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect t0 the frame member and adapted to be connected to a controlled, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces and a holding element adapted tobe wedged therebetween, means for controlling the operation of the holding element comprising a shiftable control member, a handle for the operating member, a handle for the control member, means forming a mechanical interlocking connection between one of said handles and its associated member and an abutting engagement between the other handle and its associated member, and resilient means secured to and connecting both said handles whereby to facilitate the assembly of the handles in the contro-l mechanism as a unit, said connecting means being yieldable to permit relative movement between the handles.

l5. A control mechanism as defined in claim 14, wherein said connecting means comprises a spring having portions frictionally engageable with and thereby secured to both said handles.

16. A control mechanism as dened in claim 14, wherein said connecting means comprises a resilient member of rubber-like material secured to both said handles.

1'7. A control mechanism comprising a frame member adapted to be fastened to a support, an operating member shiftable in respect tc the frame member and adapted to be connected to a device to be controlled, and means for releasably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating vmember and frame member and a holding element adapted to be wedged therebetween, and means for controlling the operation of the holding element comprising a shiftable control member, said control member being mounted within the operating member, a handle for the control member, a handle for the operating member, means forming a mechanical interlocking connection between one of said handles and its associated member and an abutting engagement between the other handle and its associated member, and resilient connecting means secured to and connecting both said handles for assembly in the control mechanism as a unit, said connecting means permitting relative movement between said handles.

18. A control mechanism comprising a frame member adapted to be fastened to a support, an

operating member shiftable within the frame member and'adapted to be connected at one end to a device to be controlled, and means for releas ably holding the operating member with respect to the frame member comprising a pair of cam surfaces on the operating member and frame member and a holding element adapted to be wedged therebetween, the operating member having operating connections disposed on opposite sides of its cam surface, means for controlling the operation'of the holding element comprising a shiftable control member having a notch for looselyireceiving said element, said control member being concentrically disposed within the operating Vmember at the holding station, and a pair'jof longitudinally reciprocable handle members connected, respectively, to' the opposite end of the operating member and to the control member, said 'handle members being shiftable relatively toward eachother to effect the release of the holding element.

19. A control mechanism comprising a, frame member adapted to be fastened to a support, an operating member shiftable within the frame member and adapted to be connected at one end to a device to be controlled, and means for, re-Y lcasably holding the'operating' member with respect to the frame member comprising a pair of cam surfaces onk the operating' `member and frame member land a holding element adapted to be wedged therebetween, means for controlling 'the operation of the holding element comprising a shiftable control member, said control member being disposed within the operating member at the holding station, and a pair of longitudinally reciprocable handle members rigidly connected, respectively, tov the other operating member and to. the Confirm member, the control member and its associated handle end of the 12 being projected axially through the operating member handle, and said handle members being shftable relatively toward each other to' effect the release ofthe holding element.

2 0. A control mechanism'as denned in claim 5, wherein the frame Sleeve cam surface engaged by the'holding element comprises a screw thread formed alongv the innerf surface of the frame. sleeve whereby relative'rotation of the operating sleeve and frame sleeve with the holding element in engagement with the screw thread effects micrometer adjustments o1 the operating sleeve.

' CHARLES A. ARENS,

REFERENCES CITED The following references are of record in the me of this patent;

UNITED s rATns PATENTS Number Name Date 432,278 Maschmeyer July l5, 1890 1,103,839v Rellay July 14, 1914 1,171,845 Heaslet Feb 15, 1'916 1,333,951 Velderber Mar. 16,' 1920 1,831,335 White Nov. 10',v 1931 1,866,244 White July 5, 1932 2,170,511 Wenn Aug. 22, 1939 2,212,375 McCarthy Aug. 20, 1940 2,262,448 Boyce et al.` Nov, 11, 1941 2,271,799 McCarthy Feb. 3, 1942 2,273,334 Shakespeare Feb. 17, 1942 2,340,830 Arens Feb. 1, 1944 FOREIGN RATENTS,

Number Country Date 481,199V Great Britain Mar. 8, 1938 396,931 France Apr. 24, 1909 595,342 Germany Apr. 9, 1934 

